fix: missing perspire log timeStamp, support null store descriptor

Author: iridiankin

packages/tools/html5/IndexedDBWrapper.js

@@ -51,7 +51,8 @@ export default class IndexedDBWrapper extends FabricEventTarget {
     this.database = event.target.result;
     this.database.onerror = (evt: Event) => {
       throw this.wrapErrorEvent(evt.target.error, `IDB.onerror`,
-          "\n\tstores:", this.storeDescriptors.map(({ name }) => name).join(", "));
+          "\n\tstores:", this.storeDescriptors
+              .map(descriptor => (descriptor ? descriptor.name : "<no descriptor>")).join(", "));
     };
   }
 

packages/toolset-worker/valma/perspire.js

@@ -269,6 +269,7 @@ exports.handler = async (yargv) => {
     }
     state.domString = server.serializeMainDOM();
     state.tick = tick;
+    state.timeStamp = Date.now();
     _writeDomString(state.domString,
         heartbeatClockFields ? JSON.stringify(heartbeatClockFields) : "<no heartbeat fields>");
     if (vExecThis && execBody) {